EP3242079B1 - Leuchtmodul, das ein laserelement umfasst - Google Patents

Leuchtmodul, das ein laserelement umfasst Download PDF

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Publication number
EP3242079B1
EP3242079B1 EP17169330.2A EP17169330A EP3242079B1 EP 3242079 B1 EP3242079 B1 EP 3242079B1 EP 17169330 A EP17169330 A EP 17169330A EP 3242079 B1 EP3242079 B1 EP 3242079B1
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EP
European Patent Office
Prior art keywords
light
cone
module
light module
detection device
Prior art date
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Active
Application number
EP17169330.2A
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English (en)
French (fr)
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EP3242079A1 (de
Inventor
Pierre Renaud
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Valeo Vision SAS
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Valeo Vision SAS
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Publication of EP3242079A1 publication Critical patent/EP3242079A1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
    • H01S5/0071—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for beam steering, e.g. using a mirror outside the cavity to change the beam direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V25/00—Safety devices structurally associated with lighting devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
    • F21V23/0442—Arrangement of electric circuit elements in or on lighting devices the elements being switches activated by means of a sensor, e.g. motion or photodetectors
    • F21V23/0457—Arrangement of electric circuit elements in or on lighting devices the elements being switches activated by means of a sensor, e.g. motion or photodetectors the sensor sensing the operating status of the lighting device, e.g. to detect failure of a light source or to provide feedback to the device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/0017—Devices integrating an element dedicated to another function
    • B60Q1/0023—Devices integrating an element dedicated to another function the element being a sensor, e.g. distance sensor, camera
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B60Q1/0408—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights built into the vehicle body, e.g. details concerning the mounting of the headlamps on the vehicle body
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/16—Laser light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/176—Light sources where the light is generated by photoluminescent material spaced from a primary light generating element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
    • F21S41/338—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector having surface portions added to its general concavity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/70—Prevention of harmful light leakage
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/095—Refractive optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/02—Structural details or components not essential to laser action
    • H01S5/022—Mountings; Housings
    • H01S5/023—Mount members, e.g. sub-mount members
    • H01S5/02325—Mechanically integrated components on mount members or optical micro-benches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/20—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers
    • H01S5/2054—Methods of obtaining the confinement
    • H01S5/2059—Methods of obtaining the confinement by means of particular conductivity zones, e.g. obtained by particle bombardment or diffusion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/30—Semiconductor lasers

Definitions

  • a light module for emitting a light beam comprising a semiconductor laser element.
  • Semiconductor laser elements have very advantageous properties, for example a very small light emitting surface, a very intense and very collimated laser beam.
  • Optical systems for laser light can therefore be designed with much shorter focal lengths than for systems using less collimated light sources, for example incandescent lamps and light emitting diodes (LEDs).
  • Optical systems for laser light thus have a particularly small footprint.
  • the laser sources used in the automobile generally comprise a semiconductor laser element capable of emitting a generally monochromatic laser beam of a given wavelength and a photoluminescent element capable of converting part of the monochromatic laser beam into a light beam having a wavelength spectrum wider than that of the laser beam.
  • a semiconductor laser element for such light sources for motor vehicle light modules poses certain problems due in particular to the fact that such a light source emits a coherent beam of substantially monochromatic light when the photoluminescent element is deteriorated or when it is moved out of the path of the laser source.
  • the type of laser used for lighting or signaling applications on board a motor vehicle emits a laser beam which is liable to pose certain safety problems in the event of failure of the photoluminescent element.
  • Such a laser beam is in particular harmful to the eyes of an observer, or at the very least risks dazzling a road user.
  • the lighting or signaling functions of motor vehicles require light beams having light having a wider spectrum than that of a laser beam, for example white light.
  • a photoluminescent element in the path of the laser beam.
  • a photoluminescent element comprises a photoluminescent substance which is excited by light whose wavelength range includes that of the laser beam, for example blue. Accordingly, the photoluminescent element emits light whose wavelength spectrum extends within a wavelength range excluding that of the laser beam or off-center from that of the laser beam, for example yellow. Thus, at least part of the incident light of a given wavelength is converted into light of other wavelengths which emitted in all directions.
  • At least another part of the incident light is scattered by the photoluminescent element.
  • the scattered light and the converted light overlap additively, for example to form white light.
  • the photoluminescent element is thus of particular importance. If the photoluminescent element were to be damaged or removed from the path of the laser beam, for example following an impact, the unconverted and concentrated laser beam could be emitted by the light module in the direction initially intended for the outgoing light beam . In these cases, safety measures should be considered to avoid endangering road users.
  • One solution envisaged is to place a device for detecting the wavelength of the laser on the path of the laser beam downstream of the photoluminescent element.
  • the photoluminescent element no longer fulfills its role, the laser beam directly hits the detection device. If this is the case, the supply to the laser element is interrupted by a means for controlling the laser element, for example an electronic control unit.
  • EP 2 784 382 A2 and DE 10 2014 205 606 A1 describe known light modules.
  • the present invention provides a light module of the type described above, characterized in that the detection device is arranged outside the second light cone and in that the light module comprises a deflection means arranged across the second light cone for deflecting incident light in a third cone of light directed towards the detection device.
  • the outgoing light beam is directed towards the outside of the vehicle, for example towards the front, to perform a lighting or signaling function.
  • the third cone is oriented in a direction distinct from the orientation direction of the second cone and / or has an opening angle greater than that of the second cone.
  • the term "light cone” applies to the envelope of a light beam. Such a cone of light is not limited to cones of revolution only. Thus it will be understood that a light cone can have sections of various shapes, for example round, ovoid, rectangular, etc.
  • a light module 10 comprising a semiconductor laser element 12.
  • the laser element 12 is configured to emit a laser beam 14, the envelope of which is delimited by a first cone 16 of light, called the emission cone 16, of very low opening angle constricted around an overall direction d. 'program.
  • the laser beam 14 will be represented by a single line. It is for example a blue laser beam 14.
  • the laser beam 14 is intercepted by a photoluminescent element 18 which is arranged in the path of the laser beam 14.
  • the photoluminescent element 18 is configured to convert the wavelength of at least a portion of said laser beam 14 into incoherent light of a wavelength different from that of the laser beam 14.
  • the photoluminescent element 18 is designed to scatter light passing through it.
  • optical element comprising a phosphor
  • the photoluminescent element 18 emits light distributed in a secondary light beam 20 of very wide opening angle compared to that of the laser beam 14.
  • the light emitted in the secondary light beam is preferably incoherent, polychromatic or white. Its light intensity is reduced compared to that of the laser beam 14. This light therefore no longer presents a danger for road users.
  • the light module 10 also comprises an optical means 22 for transforming the light coming from the element 18 Photoluminescent into an outgoing light beam oriented in an "A" direction of emission.
  • This outgoing light beam 24 is directed towards the outside of the vehicle, for example towards the front, to perform a lighting or signaling function.
  • the optical means 22 has a reflection surface 26, a main portion 26A of which is substantially parabolic.
  • the main portion 26A of the reflecting surface 26 is adapted to transform, by reflection, the secondary beam 20 into an outgoing beam 24 collimated in the "A" direction of emission.
  • the photoluminescent element 18 is arranged substantially at a focal point of the main portion 26A of the reflection surface 26.
  • the photoluminescent element 18 When the photoluminescent element 18 is no longer able to perform its function, the laser beam 14, passing close to the focus of the main portion 26A of the reflection surface 26, risks being returned by the latter in the direction " A "emission.
  • the optical means 22 comprises a guide portion which is arranged to guide at least part of the light emitted in said emission cone 16 to form a picked up light beam which is delimited by a second cone 28 of light oriented towards a determined direction "B" of sampling, hereinafter called "cone 28 of sampling”.
  • the guide portion is carried in a fixed manner by the optical means.
  • the guide portion is formed by a secondary portion 26B of the reflection surface 26 which reflects the light coming from the emission cone 16 in the sampling cone 28.
  • the secondary portion 26B having a substantially smooth surface condition, the opening angle of the sampling cone 28 remains substantially unchanged with respect to that of the cone 16 resignation. For this reason, the laser beam 14 reflected towards the direction "B" of sampling is also represented by a line at the bottom. figure 2 .
  • Said second determined direction "B" of sampling is different from the first direction “A" of emission of the outgoing light beam 24.
  • the secondary guide portion 26B is formed by a substantially planar face forming an asperity in the main portion 26A of the reflection surface 26.
  • the guide portion 26B is arranged at a downstream end of the reflection surface 26 in the direction of projection of the outgoing light beam 24, so as not to encroach on the effective surface of the reflection surface 26.
  • the light module 10 is also equipped with at least one device 30 for detecting incident light exceeding a predetermined threshold of light intensity, hereinafter referred to as “safety threshold”.
  • the detection device 30 has a surface sensitive to light.
  • the detection device 30 is designed to detect a variation in the intensity of the light radiation beyond said safety threshold. This safety threshold is determined to ensure that the light radiation is safe for the safety of road users.
  • the detection device is designed to absolutely measure the light intensity of the detected light radiation.
  • the detection device 30 is arranged to detect the light which is deflected in the sampling cone 28. Nevertheless, to give freedom of arrangement of the detection device 30, for example to make it possible to obtain a more compact and easier to adjust light module 10, it is advantageous to be able to precisely deflect the light taken towards the detection device 30. .
  • the detection device 30 is arranged outside the sampling cone 28.
  • the light module 10 comprises a deflection means 32 arranged across the sampling cone 28 to deflect the incident light into a measuring beam delimited by a third cone 34 of light, called measuring cone 34, directed towards the sensitive surface of the device. 30 detection.
  • the deflection means 32 comprises at least one optical element 36 which is crossed by the light and which comprises a face 37 for entering the light ray included in the sampling cone 28 and an exit face 38 for the light distributed in the cone. 34 measurement.
  • the deflection means 32 is formed of at least one element separate from the optical means 22.
  • the deflection means 32 comprises a single optical element 36.
  • the deflection means comprises several optical elements.
  • Optical element 36 deflects light by refraction.
  • the optical element 36 is here formed by a prism.
  • the optical element is formed by a lens.
  • the third light cone 34 has been represented by a solid line at the bottom. figure 2 .
  • the sampling cone 28 is shown in broken lines in which the light rays would continue their path in the absence of the deflection means 32. It can be seen that the sensitive surface of the detection device 30 is arranged outside the sampling cone 28.
  • the light module 10 further comprises a control means 40, for example an electronic control unit, which is able to control the deactivation of the laser element 12, for example by cutting the power supply to the laser element 12.
  • a control means 40 for example an electronic control unit, which is able to control the deactivation of the laser element 12, for example by cutting the power supply to the laser element 12.
  • the light from the laser beam 14 has been converted and scattered by the photoluminescent element 18 before being emitted to the reflecting surface 26 to form the outgoing light beam 24.
  • the guide portion 26B picks up some of the light rays, which thus have the same properties as the light rays forming the outgoing light beam 24.
  • These picked up light rays are then deflected by the deflection means 32 in the measuring cone 34 in a propagation direction oriented towards the sensitive surface of the detection device 30.
  • the light incident on the detection device 30 has a moderate light intensity which is below the security threshold, guaranteeing secure use of the light module 10.
  • control means 40 is designed to deactivate the laser element 12 when the light intensity of the light rays contained in the measuring cone 34 exceeds the safety threshold.
  • the figure 2 represents the light module 10 when the photoluminescent element 18 no longer fulfills its function.
  • the photoluminescent element 18 has for example been dislodged from its location following an impact, it is thus no longer arranged in the path of the laser beam 14.
  • the laser beam 14 In the absence of the photoluminescent element 18, the laser beam 14, the light intensity of which is potentially dangerous, directly strikes the guide portion 26B which is arranged in the emission cone 16.
  • At least part of the laser beam 14 is reflected in the sampling cone 28. Then the light guided in the sampling cone 28 is deflected by the optical element 36 in the measuring cone 34 in a propagation direction oriented directly towards the sensitive surface of the detection device 30. The light rays reaching the sensitive surface of the detection device 30 then exhibit a light intensity which has not been substantially attenuated with respect to the output of the laser beam 14. Thus, the light intensity of the light rays deflected by the optical element 36 towards the detection device 30 exceeds the safety threshold.
  • the exceeding of the safety threshold is communicated by the detection device 30 to the control means 40.
  • the control means 40 deactivates the laser element 12.
  • the control means 40 interrupts the production of the laser beam 14, preventing any harmful light radiation from leaving the light module 10.
  • the laser element 12 and the photodiode here forming the detection device 30 are carried by a common support 42.
  • the common support 42 simultaneously ensures the mechanical fixing and the electrical connection of the laser element 12 and of the detection device 30.
  • the common support 42 is here formed by a common electronic card.
  • the deflection means 32 advantageously make it possible to offset the detection device 30 in the direction of the laser element 12 on the common support 42 relative to the sampling cone 28. This allows for a more compact support 42.
  • the position of the optical element 36 forming the deflection means 32 is capable of being adjusted independently of the position of the guide portion 26B. This makes it possible to precisely adjust the direction of propagation of the measuring cone 34 towards the sensitive surface of the measuring device 30. detection, independently of the positioning tolerances of the light guiding means.
  • FIG. 3 A second embodiment of the invention has been shown on figure 3 .
  • This second embodiment has many similarities with the first embodiment. Only the differences will be detailed below.
  • the guide portion 26B returns the light rays coming from the emission cone 16 in the same general direction as the outgoing light beam 24.
  • the guide portion 26B is formed by a portion of the reflecting surface 26 which complements the main portion 26B of the reflecting surface 26.
  • the sampling cone 28 is oriented generally in the direction "A" of emission of the outgoing light beam 24.
  • the deflection means 32 here comprise a first upstream optical element 36A and a second downstream optical element 36B.
  • the optical elements both deflect light by refraction, such as prisms.
  • the upstream optical element 36A is arranged across the sampling cone 28 to thus deflect a first time the light rays entering through its entry face 37 towards the downstream optical element 36B. Then the downstream optical element 36B deflects said light rays deflected by the upstream optical element 36A in the measuring cone 34 in a propagation direction oriented directly towards the detection device 30.
  • the series of optical elements 36A, 36B forming the deflection means 32 thus makes it possible to deflect the light rays coming from the sampling cone 28 by a very large angle.
  • the geometry of the reflection surface 26 is thus simplified compared to that of the first embodiment while retaining a very compact common support 42 for the laser element 12 and the detection device 30.
  • At least one of the optical elements 36A, 36B is a separate element from the optical means 22 to allow adjustment of the direction of propagation of the measuring cone 34 independently of the positioning tolerances of the guide portion 26B.
  • FIG 4 A third embodiment of the invention is shown in figure 4 . This embodiment is similar to that which was described in the first embodiment. Only the differences will be described below.
  • the deflection means 32 comprise means for spreading the light so that the measuring cone 34 has an opening angle greater than that of the second sampling cone 28.
  • the measurement light beam is very divergent from the picked beam.
  • the measuring cone 34 is directed substantially in the same direction as the sampling cone 28. Nevertheless, part of the light rays coming from the sampling cone 28 are deflected outwardly from the sampling cone 28 due to the upper opening angle of the measuring cone 34.
  • the deflection means 32 here comprise a single optical element 36 designed to be passed through by light. At least one of the faces of the inlet face 37 and the outlet face 38 of the optical element 36 is structured to spread the outgoing light in the measuring cone 34.
  • the optical element 36 has been shown in more detail at figure 5 .
  • the inlet face 37 and the outlet face 38 of the optical element 36 are both structured to spread the outgoing light in the measuring cone 34 by refraction.
  • Each face 37, 38 thus comprises ridges making it possible to spread the light less in a plane with an opening angle ⁇ which is substantially greater than the almost zero opening angle of the sampling cone 28.
  • the surface illuminated by the measuring cone 34 is much greater than the surface illuminated by the sampling cone 28 at the height of the support 42 of the detection device 30.
  • the detection device 30 is offset outside the sampling cone 28, at the periphery and inside the measuring cone 34. Thus, the detection device 30 is exposed only to the light rays deflected by the deflection means 32 and not to the light rays continuing their path in the sampling cone 28.
  • Such an embodiment advantageously makes it possible to homogenize the light incident on the detection device 30.
  • the measuring cone 34 has an opening angle sufficient to illuminate the entire sensitive surface of the detection device 30. This makes it possible to greatly simplify the adjustment of the saturation of the detection device 30.
  • the optical element 36 of the deflection means 32 deflects the light by diffusion.
  • at least one of the faces from among the input face 37 and the output face 38 of the optical element has a surface condition favoring light scattering.
  • the inlet face 37 and / the outlet face 38 is for example grained.
  • the material constituting the optical element 36 promotes the diffusion of light.
  • a fourth embodiment of the invention has been shown on figure 7 .
  • This fourth embodiment of the invention is identical in every way to the third embodiment except for the fact that the light module 10 comprises here several light intensity detection devices. At least one of the detection devices is arranged outside the sampling cone 28.
  • each detection device 30A, 30B is able to communicate with the control means 40 to enable the laser element 12 to be deactivated when the safety threshold is exceeded is detected by one and / or the other of the devices 30A, Detection 30B.
  • Each of these detection devices 30A, 30B is arranged in the measuring cone 34.
  • the two devices 30A, 30B are here arranged outside the sampling cone 28.
  • only one of the detection devices is arranged outside the sampling cone.
  • the two devices 30A, 30B are carried by the common support 42. This makes it possible to obtain a more compact light module.
  • the presence of the two detection devices 30A, 30B makes it possible to redundantly detect the intensity of the light rays from the measuring cone 34. It is thus possible to diagnose the malfunction of one of the detection devices 30A, 30B when the detection devices 30A, 30B communicate contradictory information to the control means 40.
  • the first two embodiments make it possible to deviate the overall direction of propagation of the measuring cone 34, for example by refraction, relative to that of the sampling cone 28, while the third and fourth embodiments make it possible to deflect the light rays to obtain a measuring cone 34 having an opening angle greater than that of the sampling cone 28 without modifying its overall direction of propagation.
  • the deflection means 32 comprises an upstream optical element 36A and a downstream optical element 36B.
  • the function of the upstream optical element 36A here is to deflect the overall direction of propagation of the cone 28 of sampling by refraction. This is a prism. An intermediate beam thus emerges from this upstream optical element 36A towards the downstream optical element 36B. This intermediate beam is included in an intermediate cone 44 having an overall direction of propagation different from that of the second cone 28 of light, but their opening angles are substantially equivalent.
  • the downstream optical element 36B here has the function of deflecting part of the light rays from the intermediate cone 44 in order to spread the light in the measuring cone 34.
  • the measuring cone 34 thus has an overall direction of propagation identical to that of the intermediate cone 44 but a greater opening angle.
  • a single optical element 36 This is a prism whose exit face is grained or structured to spread the light.
  • the guide portion 26B is formed by an orifice which passes through a secondary portion of the reflection surface 26.
  • the light beam taken by this orifice 26B is thus included in a sampling cone 28 which is directed towards the deflection means 32, here similar to that which is described in the second embodiment, to be routed to the device 30 of detection.
  • This variant embodiment thus advantageously makes it possible to arrange the detection device 30 on the same support 42 as the laser element 14.
  • the optical means 22 transforming the light coming from the photoluminescent element 18 into an outgoing light beam 24 comprises a lens 46.
  • the lens 46 has an incident face 48 which receives the light coming from the photoluminescent element 18.
  • Said incident face 48 comprises a guide portion 48B which is for example formed by a metallized portion which is able to reflect the incident light rays of the laser beam 14 to form a sampling cone 28.
  • a deflection means 32 here a prism 36, deflects the light rays from the sampling cone 28 in a measuring cone 34 towards the detection device 30.
  • the light module 10 produced according to the teachings of the invention thus makes it possible to give freedom in the positioning tolerance of the detection device 30 with respect to the guide portion.
  • the deflection means comprises a separate optical element which is capable of being adjusted in position with respect to the guide portion and with respect to the detection device 30 to precisely adjust the direction of propagation of the cone 34 of measurement.
  • the possibility of obtaining a measuring beam having a wider opening angle makes it possible to illuminate the entire sensitive surface of the detection device 30, thus facilitating the adjustment of its saturation.
  • the opening angle is designed to be wide enough, it is possible to arrange two detection devices in a single measuring beam.
  • the light module 10 operates in a much more secure manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • Geometry (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Semiconductor Lasers (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Claims (15)

  1. Lichtmodul (10), insbesondere für ein Kraftfahrzeug, das dazu bestimmt ist, einen Austrittslichtstrahl (24) auszusenden, und das umfasst:
    - mindestens ein Halbleiter-Laserelement (12), das dazu bestimmt ist, einen Laserstrahl (14) in einem ersten Lichtkegel (16) auszusenden;
    - ein photolumineszierendes Element (18), das dazu bestimmt ist, mindestens einen Teil des Laserstrahls (14) umzuwandeln;
    - ein optisches Mittel (22) zum Umwandeln des von dem photolumineszenten Element (18) kommenden Lichts in den Austrittslichtstrahl (24), der in einer Emissionsrichtung (A) ausgerichtet ist, wobei das optische Mittel (22) einen Führungsabschnitt (26B) aufweist, der so angeordnet ist, dass er mindestens einen Teil des in dem ersten Lichtkegel (16) emittierten Lichts in einen zweiten Lichtkegel (28) leitet;
    - mindestens eine Vorrichtung (30) zur Detektion von einfallendem Licht, das größer als eine vorbestimmte Schwelle der Lichtstärke ist;
    dadurch gekennzeichnet, dass die Detektionsvorrichtung (30) außerhalb des zweiten Lichtkegels (28) angeordnet ist und dass das Lichtmodul (10) ein Mittel (32) zur Ablenkung umfasst, das quer über den zweiten Lichtkegel (28) angeordnet ist, um das einfallende Licht in einen dritten Lichtkegel (34) abzulenken, der auf die Detektionsvorrichtung (30) gerichtet ist.
  2. Lichtmodul (10) nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass das Ablenkmittel (32) mindestens ein optisches Element (36, 36A, 36B) umfasst, durch das das Licht hindurchgeht und das eine Eintrittsfläche (37) für das Licht des zweiten Lichtkegels (28) und eine Austrittsfläche (38) für das Licht des dritten Lichtkegels (34) aufweist.
  3. Lichtmodul (10) nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass das optische Element (36, 36A) das Licht durch Brechung ablenkt.
  4. Lichtmodul (10) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Mittel (32) zur Ablenkung Mittel zur Ausbreitung des Lichts umfassen, so dass der dritte Lichtkegel (34) einen Öffnungswinkel aufweist, der größer ist als der des zweiten Lichtkegels (28).
  5. Lichtmodul (10) nach Anspruch 4, dadurch gekennzeichnet, dass mindestens eine der Flächen zwischen der Eintrittsfläche (37) und der Austrittsfläche (38) des optischen Elements (36) einen das Licht streuenden Oberflächenzustand aufweist.
  6. Lichtmodul (10) nach einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, dass es mindestens zwei Detektionsvorrichtungen (30A, 30B) umfasst, die jeweils im dritten Lichtkegel (34) angeordnet sind.
  7. Lichtmodul (10) nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass jede Detektionsvorrichtung (30A, 30B) außerhalb des zweiten Lichtkegels (28) angeordnet ist.
  8. Lichtmodul (10) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das optische Mittel (22) eine Reflexionsfläche (26) umfasst, von der ein Hauptteil (26A) das von dem photolumineszierenden Element (18) kommende Licht reflektiert, um den Ausgangslichtstrahl (24) zu bilden.
  9. Lichtmodul (10) nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass der leitende Teil durch einen sekundären Teil (26B) der Reflexionsfläche (26) gebildet wird, der das von dem ersten Lichtkegel (16) kommende Licht in den zweiten Lichtkegel (28) reflektiert.
  10. Lichtmodul (10) nach Anspruch 8, dadurch gekennzeichnet, dass der leitende Teil durch eine Öffnung (26B) gebildet wird, die durch einen sekundären Teil der Reflexionsfläche (26) hindurchgeht.
  11. Lichtmodul (10) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Detektionsvorrichtung (30) und das Laserelement (12) von einem gemeinsamen Träger (42), insbesondere von einer gemeinsamen elektronischen Karte, getragen werden.
  12. Lichtmodul (10) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass es ein Mittel (40) zur Steuerung des Laserelements (12) umfasst, das dazu bestimmt ist, die Aussendung des Laserstrahls (14) zu unterbrechen, wenn die Erfassungsvorrichtung (30) eine Intensität erfasst, die größer als der vorgegebene Schwellenwert ist.
  13. Lichtmodul (10) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der leitende Teil (26B) der optischen Mittel (22) mindestens einen Teil des in dem ersten Lichtkegel (16) emittierten Lichts in einen zweiten Lichtkegel (28) leitet, der in einer zweiten bestimmten Richtung (B) ausgerichtet ist, die sich von der ersten Emissionsrichtung (A) des austretenden Lichtstrahls (24) unterscheidet.
  14. Lichtmodul (10) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß das Ablenkmittel (32) durch mindestens ein optisches Element (36, 36A, 36B) gebildet wird, das von dem den Führungsteil tragenden Element getrennt ist.
  15. Lichtmodul (10) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Führungsteil (26B) fest von den optischen Mitteln (22) getragen wird.
EP17169330.2A 2016-05-04 2017-05-03 Leuchtmodul, das ein laserelement umfasst Active EP3242079B1 (de)

Applications Claiming Priority (1)

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FR1654056A FR3051535B1 (fr) 2016-05-04 2016-05-04 Module lumineux comportant un element laser

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EP (1) EP3242079B1 (de)
JP (1) JP2017208331A (de)
KR (1) KR20170125743A (de)
CN (1) CN107388152B (de)
FR (1) FR3051535B1 (de)

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FR3051534B1 (fr) * 2016-05-04 2020-10-02 Valeo Vision Module lumineux comportant un element laser
FR3051535B1 (fr) * 2016-05-04 2018-06-29 Valeo Vision Module lumineux comportant un element laser
DE102016117411B4 (de) * 2016-09-15 2020-03-26 Varroc Lighting Systems, s.r.o. System zur Beleuchtung für ein Kraftfahrzeug mit einer Laserlichtquelle

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US4942584A (en) * 1988-06-22 1990-07-17 Morihiro Karaki Semiconductor laser apparatus driving system
JP2001273670A (ja) * 2000-01-19 2001-10-05 Olympus Optical Co Ltd 光ピックアップ装置
WO2003084015A1 (fr) * 2002-03-28 2003-10-09 Fujitsu Limited Dispositif a reseau de lasers et procede de commande de reseau de lasers
US6975465B1 (en) * 2002-04-03 2005-12-13 University Of Central Florida Research Foundation, Inc. Method and apparatus for use of beam control prisms with diode laser arrays
DE102012220481A1 (de) * 2012-11-09 2014-05-15 Automotive Lighting Reutlingen Gmbh Lichtmodul
JP2014187326A (ja) * 2013-03-25 2014-10-02 Toshiba Lighting & Technology Corp 固体照明装置
DE102014205606A1 (de) * 2014-03-26 2015-10-01 Osram Gmbh Beleuchtungsvorrichtung mit Lichtmischelement und Leuchtstoffvolumen
FR3051535B1 (fr) * 2016-05-04 2018-06-29 Valeo Vision Module lumineux comportant un element laser

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US20170324214A1 (en) 2017-11-09
EP3242079A1 (de) 2017-11-08
US20180337511A1 (en) 2018-11-22
US10090635B2 (en) 2018-10-02
CN107388152A (zh) 2017-11-24
FR3051535A1 (fr) 2017-11-24
CN107388152B (zh) 2021-05-04
FR3051535B1 (fr) 2018-06-29
US10511136B2 (en) 2019-12-17
JP2017208331A (ja) 2017-11-24
KR20170125743A (ko) 2017-11-15

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